Metal plate for manufacturing vapor deposition mask, inspection method of metal plate, manufacturing method of metal plate, vapor deposition mask, vapor deposition mask device and manufacturing method of vapor deposition mask

摘要

PROBLEM TO BE SOLVED: To provide a metal plate, a method for inspecting and manufacturing a metal plate, and a method for manufacturing a vapor deposition mask, a vapor deposition mask device and a vapor deposition mask, which can stably provide a resist pattern having a narrow width on the surface of the metal plate with high adhesion. provide. SOLUTION: A metal plate test piece 50 having a surface having a longitudinal direction D1 of a metal plate and a width direction D2 orthogonal to the longitudinal direction is prepared. Of the reflected light L12 with respect to the incident light L11 incident on the surface of the test piece in the first plane P1, the first surface emitted from the surface at an angle of 45 ° ± 0.2 ° in at least one plane orthogonal to the surface. The second surface reflectance of the reflected light and the reflected light L22 with respect to the incident light L21 in the second plane P2 is measured, and when the average reflectance is 8% or more and 25% or less, it is determined to be a good metal plate. [Selection diagram] FIG. 9